body {  
    font-family: Arial, sans-serif;  
    margin: 0;  
    padding: 0;  
    line-height: 1.6;  
    font-size: 1rem; /* 基础字体大小1rem = 16px */  
}  

.container {  
    width: 375px;  
    margin: 0 auto;  
    padding: 1rem;  
    box-sizing: border-box;  
}  

h1, h2 {  
    margin: 1rem 0;  
}  

p {  
    margin: 0.5rem 0;  
}  

ol {  
    margin-left: 1.5rem;  
}